import * as i0 from "@angular/core";
/**
 * A service that allows the user to toggle between light and dark themes.
 */
export declare class ThemeService {
    private initialized;
    /**
     * Toggle the theme between light and dark.
     */
    toggle(): void;
    /**
     * Initialize the theme based on the user's previous theme preference.
     *
     * If there is no previous theme preference, the default theme will be used.
     * @param theme The theme to initialize. If setted, this will override previous user's theme preference.
     */
    init(theme?: 'default' | 'dark'): void;
    /**
     * Returns true if the current theme is dark. Otherwise, returns false.
     */
    get isDark(): boolean;
    static ɵfac: i0.ɵɵFactoryDeclaration<ThemeService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ThemeService>;
}